| 摘要 |
The present invention concerns a collar (10) of a respiratory device, in particular a tracheotomy cannula (100) or an endotracheal tube, wherein the collar (10) embraces a respiratory tube and is fixed thereto in sealing relationship and the collar comprises an inner film (1) and an outer film (2), wherein the inner and the outer films are separate from each other and the outer film comprises an elastically easily stretchable material. To provide a corresponding collar and a respiratory device provided with such a collar, which on the one hand is sufficiently stable and easy to handle but which allows no or only very small tight folds to be formed which do not adversely affect the sealing integrity of the engagement between the collar and the wall of the trachea even at low internal pressures in the collar of for example 20 hPa, it is proposed in accordance with the invention that the outer film is expandable at an internal pressure of at most 50 hPa to a diameter which is larger than the diameter of a trachea for which the respiratory device is intended, and in particular is at least 1.5 times the outside diameter of the tube, and the inner film comprises a material of lower elastic stretching, wherein the inner film is produced with oversize and without an external restriction at an internal pressure of at most 20 hPa assumes a diameter which is larger than the diameter of a trachea for which the collar is intended. |
